Why do siblings purposefully fight?

Jake Morris

New member
I'm the middle child, so I just stay out of it. But my 19 year old brother always purposely starts fighting with my 11 year old sister and it always ends in tears for my sister. I honestly cannot see why he does it. I think he does it to kill time, but what I don't understand is why he'd choose to argue with someone eight years younger than him when he could be killing time other ways.

I'm not sure if it's common or not, but why the hell does he do it? It's a pain to hear them yelling then hearing my sister crying every fortnight or so.
 
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